roy@seismo.CSS.GOV@phri.UUCP (01/06/87)
I have been appointed to hook up an answering machine in our office, on one of those multi-line key phones. I think they figured that since I'm the computer jock, I must know how phones work. Silly them. :-) The phone has a 50-pin conectorized cable coming out of it; presumably all I have to do is find the right pair and tap off some wires to an RJ-11 and plug the answering machine in. If somebody would be so good as to send me a wiring diagram for the connector (is there a standard wiring pattern?) I think I could take it from there. I found a little gizmo which has male and female 50-pin connectors and a panel of about 2 dozen screw terminals bringing out many of the pins in the "lower half" of the connectors (roughly pins 15-35). The terminals are labeled A1, A2, B1, B2 .... A12, B12, V, SG. Most of the pins are wired straight through from one connector to the other. Some of the other pins only go to a screw terminal, and some are wired straight through plus a tap to a terminal. I assume the [AB]# pairs are tip and ring (I don't actually know much, but I can talk jargon as well as anyone) for each of 12 lines; is that right? What about V and SG? If I can find the right pair, can I just hook the answering machine up to that and ignore the extra wires for the key equipment hiding in a closet some where?
bet@mcnc.org@ecsvax.UUCP (01/22/87)
I don't know about the actual pin layout of those connectors, but I have
hooked up a modem to one. Graybar makes a box called a Supertap
(undoubtedly there are others) that brings out the first 4 lines of a
key system to modular jacks; to work in such a hookup the modem must
support A-A1 signalling (short two additional pins, called A and A1, to
assert the line -- this gets the dialtone and lights up the in-use
lights on everybody elses phones). I know the standard Hayes Smartmodem
1200 external modem can be switched to assert A-A1; that's what I
installed. If the lines are in a rotary (a set of lines all answering
the same incoming number) it makes sense to try to hook up the modem to
the *last* line in the rotary; it is the line most likely to be free. No
matter how you hook the sucker in other people will be able to disrupt
the modem conversation by picking up that line while it is in use; this
is the nature of key systems. It is always much better to try to get a
separate line.
-Bennett
--
Bennett Todd -- Duke Computation Center, Durham, NC 27706-7756; (919) 684-3695
UUCP: ...{decvax,seismo,philabs,ihnp4,akgua}!mcnc!ecsvax!duccpc!bet
BITNET: DBTODD@TUCC.BITNET -or- DBTODD@TUCCVM.BITNET -or- bet@ECSVAX.BITNET
terrorist, cryptography, DES, drugs, cipher, secret, decode, NSA, CIA, NRO.